Soft water!
I tried water changing and the water is just as soft as it was a few days ago. All my remaining parameters are fine every time I check. The KH shows 3°KH and as far as I know it should be at least 6°. What should I do in this case?

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Soft water!
I tried water changing and the water is just as soft as it was a few days ago. All my remaining parameters are fine every time I check. The KH shows 3°KH and as far as I know it should be at least 6°. What should I do in this case?